Imposing nodes at arbitrary locations for general elastic structures during harmonic excitations

Cha, P.D.

doi:10.1016/s0022-460x(03)00495-4

Cited by 23 publications

(14 citation statements)

References 7 publications

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“…To reduce the vibrations at handle location, the multi-axial absorber ( x -axis and z -axis absorber) is attached near handle support, which becomes the collocated case, that is, absorber attachment location and vibration reduction location are same. Now as explained in earlier research, 3–6 for the collocated case, the vibration absorber is required to be tuned to the operating frequency of grass trimmer (121 Hz) in order to reduce the vibrations at handle support locations.…”

Section: Frequency Analysis Of Grass Trimmermentioning

confidence: 99%

“…The studies showed that the vibrations are reduced at desired location on machines which can be modelled as a beam using vibration absorber. 3–9 Cha 3 used elastic mounted masses to induce single or multiple nodes along an elastic structure subjected to harmonic excitations. The focus of Cha and Rinker 4 was on enforcing nodes at desired location of damped Euler–Bernoulli beam during forced harmonic excitations using damped vibration absorbers.…”

Section: Introductionmentioning

confidence: 99%

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Grass trimmer hand-arm vibration reduction using multi-axial vibration absorber

Patil

2019

Noise & Vibration Worldwide

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In this investigation, the novel multi-axial vibration absorber is proposed to reduce the handle vibration of petrol engine grass trimmer. The proposed vibration absorber is designed using Dunkerley’s equation and fabricated for testing. The experimental modal analysis of absorber is conducted to find resonance frequencies of the absorber and to validate the results obtained from equations. The experimental tests are carried on grass trimmer with absorber attached near handle location to find effectiveness of absorber in reducing hand-arm vibrations in the x, y and z directions. The result indicated that the total vibration value measured at the handle of grass trimmer is reduced by substantial level with the attachment of multi-axial vibration absorber.

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Section: Frequency Analysis Of Grass Trimmermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grass trimmer hand-arm vibration reduction using multi-axial vibration absorber

Patil

2019

Noise & Vibration Worldwide

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“…Using the same method, Cha and Wong [23] analyzed a freely vibrating structure with a series of attached sprung masses aiming to impose multiple nodes for any normal mode. Cha [24] used a set of sprung masses to impose a single or multiple nodes anywhere along a vibrating beam. Alsaif and Foda [25] have applied the dynamic green function to calculate the optimal values of masses and/or springs and their locations along a beam in order to confine the vibration at an arbitrary location.…”

Section: Introductionmentioning

confidence: 99%

Creating Nodes at Selected Locations in a Harmonically Excited Structure Using Feedback Control and Green’s Function

Albassam

2019

Shock and Vibration

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The paper deals with designing a control force to create nodal point(s) having zero displacements and/or zero slopes at selected locations in a harmonically excited vibrating structure. It is shown that the steady-state vibrations at desired points can be eliminated using feedback control forces. These control forces are constructed from displacement and/or velocity measurements using sensors located either at the control force position or at some other locations. Dynamic Green’s function is exploited to derive a simple and exact closed from expression for the control force. Under a certain condition, this control force can be generated using passive elements such as springs and dampers. Numerical examples demonstrate the applicability of the method in various cases.

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“…Research on suppressing vibration in a region or the particular span of an elastic structure by using the spring mass vibration absorber has been reported recently. (Cha, 2004(Cha, , 2005 employed spring-mass vibration absorber to reduce vibrations at desired locations by imposing node technique (Hao et al, 2011). Suppressed the hand-arm vibration in electric grass trimmer by installing tunable vibration absorber at optimum location.…”

Section: Introductionmentioning

confidence: 99%

Vibration Isolation of Lumped Masses Supported on Beam by Imposing Nodes Using Multiple Vibration Absorbers

Patil

Awasare²

2016

MER

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In this paper, variable stiffness damped absorbers are used to isolate the substructures of Euler-Bernoulli beam, modelled as lumped masses, from vibrations. The novel algorithm is developed that can be used to determine the required absorber masses and resonance frequencies to impose nodes at selected locations on beam with the constraint of vibration amplitude of absorber mass. Numerical simulations are performed to show the effectiveness of the proposed algorithm. Experimental test is conducted on a cantilever beam with two absorbers to verify the numerical results.

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Imposing nodes at arbitrary locations for general elastic structures during harmonic excitations

Cited by 23 publications

References 7 publications

Grass trimmer hand-arm vibration reduction using multi-axial vibration absorber

Grass trimmer hand-arm vibration reduction using multi-axial vibration absorber

Creating Nodes at Selected Locations in a Harmonically Excited Structure Using Feedback Control and Green’s Function

Vibration Isolation of Lumped Masses Supported on Beam by Imposing Nodes Using Multiple Vibration Absorbers

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